so about help i need is game project like tower defense but i don’t have any experience for make game before i try to do it by my self i mean my experience for make tower defense is 0 so i need some lesson
am not very good at art just only basic
well i migth to be rude just warning maybe i might make video how to make tower defense for any people hope not lazy
and uh sorry for bad english i am not native for english
Making a Tower Defense game is NOT simple using App Inventor. It requires a Canvas, Image Sprites for your enemies and towers and a Clock to handle movement and targeting logic. To get you started, learn how to use the Canvas and Sprites and basic animation with App Inventor. You might want to visit https://static1.squarespace.com/static/63125c822016031acb8ce16a/t/6a0e3e484f187425d91fe636/1779318346012/chapter17.pdf
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for some ideas.
sorry for slow reply but thank you for guide
hey uh about how to make clone enemy by not create other ball or image
Without using a dynamic extension, you just create some "spare" imagesprites (or balls if you prefer) and make them visible and animate them as required.
Otherwise you will need a dynamic components extension to generate new imagesprites or balls at runtime.
is there are any code example? or some example?
For which approach ?
uh actually i new here and this is just school project so i make tower defense
Yes, I got that.
Do you want to have some hidden sprites, or do you want to generate them dynamically ?
generate them like that
there were two options...
oh but i gonna do some test tower place ment and fail after drag
Sounds like I need to leave you to sort a few things out!
In the meantime, can you confirm if you are developing just for Android devices, or just for IOS (Apple) devices, or for both ?
uh only android but if it complete i might upload on itch io as free by the wway i might go sleep soon
For dragging problems, search this board for Sprite Cannibalism.
use Tim’s advice, just create some "spare" imagesprites (or balls if you prefer) and make them visible and animate them as required. This should work well provided you have a reasonable number of total enemy objects. 
What have you tried?
You probably would have no trouble using 20 or perhaps 100 objects.
well i will try at least 40 enemy but it will be endless this tower defense inspire by TDS on roblox
so uh should i make tap or click and choose unit? instead of drag and place?
Drag and place is crowded.
Offer choice of places to build and what to build.
I like list pickers for making selections.